1999-2013 GM 1500 LS Gen III/IV Small Block Main Stud Kit (118130100)Description For engine builders who demand the highest level of strength and precision in their fasteners, the PPE Head Stud Kit is the ultimate solution for high performance LS small block engines. With a focus on accuracy and strength, each stud is center less ground with precision and is thread rolled to meet Mil S 8879 specification, resulting in increased durability and reduced stress at the threads. With an independently tested and verified